Form for building concrete structures.



manned sept. 2o, 1910. r

PPLXUAYION FILED 00T. 7, 1903,

, n. M. DULLBR. FORM FOR BUILDING CONCRETE S'LRUG'I'UKES.V

ATTORNEY D. DULLER.' l mm: for.l mmm@ mrow-*Y1 STRUCTURES.

Patented Sept. 26.191@

n a SHEETS-sum1" z.

n I /m/Eivron ,z BY

ATTORNEY Patented Sept. 20, 1910, f

APPLIOATIOH FILED 00T. '1. 1909.

U D M. DULLER. fom PUR' BUILDING CONCRETE STRUCTURES.

i DAVID M. DULLER, or HOUSTON, TEXAS.

FORM FOR BUILDING CONCRETE STRUCTURES.

T o all whom it may concern: i

Be 1t known that l, DAvin M. Domain, a

ycitizen o the United States` and a resident and useful Improvements in Forms forl Building Concrete Structures, of which the following is a' specification.

M v invention is an improvementl in forms for building concrete struet1ues,',and .consists in certain novel construct-ions, .and combinations ofv parts, hereinafter described and claimed. f

The object of the invention is to provide a form of the character specified more especially adapted for figures .circular in cross section. and composed of a pluralityv of strips hingcdedge to edge, wherein the y width of the. individual strips bears a constant ratio to the unit of measure.

Referring to the drawings forming a part hereof Figure 1' is a front view of a forni with the walls detached. Fig'. 2 is a transverse section of a semi-circular form, Fig. 3 is a similar view of a quarter circle. Fig. l is a front. view of the flexible rod for hingiinglr thestrips together. Fig. 5 is an end .view of a portion of a form` with the strips in the same plane. Fig. (l is a. similar view with thestrips flexed on each other'.` Fig'. 7 is a partial edge view of a strip. Fig. 8 isa similar View of the. adjoiningP strip. Fig. 9 is a side view of the means for connecting the sections of the form together. Fig. 10 is a plan view of the same. Fig. 11 is an end view lookingl at. one end and Fig. 12 is a similar view lookin, r attbe other end` v The embodiment of the invention shown in the drawings, consists of a pluralitjy of form sections, each of which is composed of a plurality of strips 1 arranged side by side` and secured together by flexible rods Each of the strips is concave on one edge as shown at 3, and convex on the other as shown at 4, and they are arraneed with the convex edge of the one fitting into the concave edge of the other as shown more especially in Figs. 5 and 6.

Each of the stripsis provided with a plu rality of transverse. openings 5, arranged at. .spaced intervals with respect. to each other, and the correspomtiner openings of the strips register when the said :trips are arranged as shown in Fig. 1. (ln the convex edge of the strips. eacb'of the openings is widened from side to side, as rindicated at.6

in Figs. 5. 6 and S, 'and the flexible rod 2 is f 'UNITED srArEs rignnr ernten passed through each set of the registering; i

openings. llacl. rod is provided at one end with a head T, and at the otl'i'er with a threaded portion 8,v which is'engaged b v a nut 9 to secure the strips together. 1 The outermost strips are recessed as shown at 10 in Fig. l, to receive the head and the not respectively, and the nuts are turned tightenougrh to, hold the strips together, while permitting them to bend laterali;v with respectto each other, as shown in Figs. Q, 3, 5 and 6.

Upon one face, each of the sections is provided with a plnralitv of eyes 11, and with af'pluralit'v of hinge sections, by means of which the form sections may be secured to the other sections. or one edfre of a form section maybe secured to the other.

The hinge section upon one edge of the form section comprises a plate or base l2, having openings 13. wherebyv it may be secured to 'a strip b v bolts 14. and provided with a pair of spaced transversely perforated lugs 15. A stem 17 is provided with an eye 16, which is received between the lugs, and a bolt 16 passes through the lugs vand the eye. The opposite end of the boltis threaded as at 1S, and is engaged by a. nut 19, which engages the opposite lnnee section in a manner to be described. T ne other hinge section comprises a plate Q0. having openings :21 for receiving bolts 22 whereby it may be secured to a strip, and provided with spaced lues The lags are recessed. as at 24, on their .outer faces,

'the bottoms of the recesses being concave from above downward. and a washer :'25, havingr one face shapedfto titthe recesses, is arrangedY on the stem 17 between the not, and the lugs.

Each of the form sections is provided noon oneI side edge. with a plurality of the hinge sections shown in Fig. Il, and upon the other edge with a corresponding numlber of the sections shown in Fig. 12, and 'the form sections mayl be secured to cach other. or the edges of one sec-tion may be secured together. Y

'l`o secure the hinge sections together" the stem 17 is turned into the position shown in Fig. il. with the outer end between the lugs Q3, and the nut. is tightened nntil the washer 25 engages the recesses as shown. To

disengage the sections the nut is loosened until the washer will pass the lugs, and the stein is turned upwardly outJ of engagement the diaiiict-er, whether inches. feet or yardn.

each Strip is made. 3.1416 times such unit of measure. By this arrangeii'ient when the forms are. iisedfon :articles circular or ap proximately circular in cross section and ofi lciimvn diameter, no calculation is necessary. For every unit of measure of the diameter of 'the strips being,r widened from face to face,

flexible rods traversing the openings, for securimgr the strips together. pairs of spaced lugs arranged long fitudinall}v of the outerrecessed outer faces, a washer on the stem having a convex face fitting the recesses, and :runt for forcing the washer toward the lugs.

the article to be. formed, one strip is used For instance, to inake a column 12 inches in diameter, using a forni material 1 `inc-Ei in lnekncw, a form having a width of 13 strips each lfiill inches wide will he used, one

inch '-iiig for thickness of strip. For roh .unins rmlygozial in cross section, the .srps

may lic used in the saine manner, andthe greater the number of sides, the more nearly will the dimensions be correct;

v llliile. more especially adapted for objects circular, or approximately circularin cross i section.' the improved forms may be used in an; other Akind of work, since they are easily connected andv disconnected, and require no especial skill in their rrianipulation.

The strips maybe made of any suitable material, and of any desired proportions as to leneih and thickness. and also as to Width, when the special function. above de- ,2 srrihcd it; not intended to bein-ade use of. The forni sections mayT be lienty intoji'lie shapes 'ilioun in Figs. 2 and 3, the increment.

o the strips with respect to each other being peiniitted h v the Ilexiliiiity of the rod, and

' 2.. A foi-in sectioncomprising a Series of f strips, each having one edge convex and the other ceiieave from face to face, the strips being arranged side by vside with the Yconvex edge of one tiltingl the concave edge ofthe suct'eeding strip id series ha rin;r :i plurality of' traiisvcrsr.x refristerii'ig openings, the ends of the openinirs on the convex sides of the .stripf'elieingr widened from face to face, flexible rods'traversing the openin'rs, for securing the strips together, and meansv on the' outermost strips :it each 'side of the form `sections, for securingr .said strips together.

3. A forni section comprising a .series of strips, eaeh having one edge. convex, and the. other concave from side to side, the strips` being arranged side h v side with the convex succeeding stri p, said strips haringr register` ingtransverse openings, the opeiungson the eonrcxerlge being' enlarged -froni face to*v face of the strip, flexible rods traversing: the

i. rods for seeming the si rips together.

by the widening of the ends. of the openings, i

aiirl niar be retained in shape in any suitable :iL-inner. k f Y i I Claiiii:

l. A form section comprising a serias of strips, each haring one edge convex and the other concave troni face to face, lthe strips beine' arranged side. hy side with the convex succeeding; strip, said series having a plural ity ot transiti-.rse registering openings, the

ot one tilting the concave edge of the cndsvf'it the. openings 0g the ironing; Sid@ 0f openings. and iiieans in vconnection with the 4. forni section coiiipi"isinf r a series ofA sti'ips-airaiiged side by .side with the edge ot' one ahnttiiigr the edge of the othe", said strips haring registering traiisrersi open4 ingsy the openings on one edge lieinglr enlarged from fai-e to tace of the. sii-ip, ilexilile rods traversing the openings. and nicaiis in connection with the rods for securing the stripsV together. j l

' DVD. M. l`)ULLER.

ilviini-ss' v Y V Girls. 1I. lli-rennen.; Vini. C. Hare. Y 

